Digest::JHash(3) User Contributed Perl Documentation Digest::JHash(3)NAMEDigest::JHash - Perl extension for 32 bit Jenkins Hashing Algorithm
SYNOPSIS
use Digest::JHashqw(jhash);
$digest = jhash($data);
# note that calling jhash() directly like this is the fastest way:
$digest = Digest::JHash::jhash($data);
DESCRIPTION
The "Digest::JHash" module allows you to use the fast JHash hashing
algorithm developed by Bob Jenkins from within Perl programs. The
algorithm takes as input a message of arbitrary length and produces as
output a 32-bit "message digest" of the input in the form of an
unsigned long integer.
Call it a low calorie version of MD5 if you like.
See http://burtleburtle.net/bob/hash/doobs.html for more information.
FUNCTIONS
jhash($data)
This function will calculate the JHash digest of the "message" in
$data and return a 32 bit integer result (an unsigned long in the
C)
EXPORTS
None by default but you can have the jhash() function if you ask
nicely. See below for reasons not to use Exporter (it is slower than a
direct call)
SPEED NOTE
If speed is a major issue it is roughly twice as fast to do call the
jhash() function like Digest::JHash::jhash('message') than it is to
import the jhash() method using Exporter so you can call it as simply
jhash('message'). There is a short script that demonstrates the speed
of different calling methods (direct, OO and Imported) in
examples/oo_vs_func.pl
AUTHORS
The JHash implementation was written by Bob Jenkins <bob_jenkins [at]
burtleburtle [dot] net>.
This perl extension was written by Andrew Towers <mariofrog [at]
bigpond [dot] com>.
A few mods were added by James Freeman <airmedical [at] gmail [dot]
com>).
SEE ALSO
http://burtleburtle.net/bob/hash/doobs.html
LICENSE
This package is free software and is provided "as is" without express
or implied warranty. It may be used, redistributed and/or modified
under the terms of the Artistic License 2.0. A copy is include in this
distribution.
perl v5.14.1 2010-09-04 Digest::JHash(3)
